I would not put over 1500 lbs on a wood framed floor. I would not put over 900 lbs on an interior wall. I'm a contractor. If you're ever concerned about the weight of a tank, look above the tank. If you start seeing the spackle over the nails, it's too much weight. That'll be you're first clue, as everything else can flex and move, but spackle is not flexible and will crack when the floor is flexing down.
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